I'm booking a car to drive OW from NW France to the SE end over 6 weeks. Given the distance that will be covered, a diesel engine is a no-brainer.

Question: If I book a diesel category ("VOLKSWAGEN POLO DIESEL or similar"), will I actually get one? I looked at the extras and there's this extra-cost option "Diesel guaranteed (only available on EDMR, CDMR, EVMR, IVMR and SDMR)".

Is this a mistake or does Europcar not guarantee diesels?